High-resolution VLA observations of the W3(OH) methanol masers

Abstract

view Abstract Citations (36) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Resolution VLA Observations of the W3(OH) Methanol Masers Menten, K. M. ; Johnston, K. J. ; Wadiak, E. J. ; Walmsley, C. M. ; Wilson, T. L. Abstract VLA observations of the 9(2)-10(1) A(+) transition of methanol (CH3OH) with 0.08-arcsec resolution toward W3(OH) are presented. The emission arises from at least eight regions situated on a crescent-shaped arc which is aligned in approximately the N-S direction in front of the compact H II region. The angular sizes of the individual regions are less tha 0.04 arcsec, the brightness temperature of the most intense region is at least 10 to the 7th K. A VLBI experiment gave no fringes, implying a lower limit of 0.003 arcsec on the angular size or an upper limit of 2 X 10 to the 9th K on the brightness temperature of the strongest feature. There is a close resmeblance between the spatial distribution of the CH3OH and OH maser emission. It is concluded that the conditions required for maser action of both species must be closely related. Publication: The Astrophysical Journal Pub Date: August 1988 DOI: 10.1086/185232 Bibcode: 1988ApJ...331L..41M Keywords: H Ii Regions; Interstellar Masers; Methyl Alcohol; Star Formation; Very Large Array (Vla); Brightness Temperature; High Resolution; Hydroxyl Emission; Very Long Base Interferometry; Astrophysics; INTERSTELLAR: MOLECULES; MASERS; NEBULAE: H II REGIONS; STARS: FORMATION full text sources ADS | data products SIMBAD (1)